Mochovce 4 connected to the grid

Slovakia's Mochovce 4, a 471 MWe VVER-440 reactor, was connected to the grid at 20% power on 15 October 2026, becoming the country's newest nuclear unit. The phasing-in followed criticality on 6 August and a series of tests; a delay of two days occurred due to a non-standard electrical response that required repeat testing. The unit will undergo staged power increases culminating in a 144-hour run at 100% capacity. Mochovce 4 is expected to supply about 13% of Slovakia's current total electricity consumption. Its completion follows Mochovce 3's entry to commercial operation in October 2023. The four-unit plant began construction in 1982, with units 3 and 4 restarted in 2008 at an estimated cost of EUR6.7 billion after a 16-year halt.

Where this fits

Mochovce 4 is a firm, low-emission, low-material electricity source coming online in central Europe at scale. It strengthens the case that nuclear completion is technically and operationally feasible even after decades of delay, and that firm dispatchable power remains the backbone of reliable grids. Slovakia already sources over 60% of its electricity from nuclear; Mochovce 4 will deepen that security by adding capacity without weather dependence, transmission overbuild, or reliance on imported batteries and processed minerals from China.

What it means

Australia has banned nuclear generation by law while building a grid dependent on renewable output firmed by gas and backed by batteries whose supply chain is concentrated in China. The Mochovce timeline, despite its delays, demonstrates that nuclear plants operate for decades at high capacity factors and require no critical-material supply-chain vulnerability. Every year Australia defers the nuclear option extends dependence on weather-driven output, gas firming, and strategic reliance on Beijing's control of the solar, battery and inverter supply chain.